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HARDWARE INFORMATION
The transceiver comprises 16 printed circuit
board subassemblies plus one optional
subassembly, as Figure 5-1 shows:
Figure 5-1 ORION II Subassemblies
Part #
Name
81908
Input/Output Board
(I/O)
81909
Low Pass Filter
(LPF)
81993
Power Amplifier
(PA)
81906
RF Converter
(RFCNV)
81999
9 MHz IF (IF)
82002
I.F. Converter
(IFCNV)
81907
Subreceiver (SUB)
81995
Logic and DSP
(DSP)
82019
Keypad (KEY)
81936
Power Distribution
Board (PWR)
81912
Synthesizer
(SYNTH)
81916
Motherboard (MBD)
82018
Rear Connector
Board
81957
Sweep Amplifier
81986
optional Autotuner
82017
Audio board
See Figure 5-2 for a block diagram showing
the relationship of these subassemblies in the
transceiver. A11, the motherboard, forms
ORION II's central electrical spine
interconnecting all but two of the printed
circuit boards (PCBs). For clarity, the block
diagram does not explicitly show A11's
myriad interconnections. Miniature coaxial
cable and connectors carry essentially all
566 manual
Part # 74410
Printed in USA
signals between boards. Shield partitions
suppress possible inter-board crosstalk.
Subassembly Location
The centrally located motherboard (A11)
connects the logic board (A7), keypad board
(A8), and other front panel parts with the I/O
(A0) and rear connector (A12) boards which
Designator
populate the rear panel. Along the way, A11
A0
picks up DC and control line connections
from A1, A4, A5, and A6 in 4 compartments
above the chassis deck. Below the chassis
A1
deck, A3, A9, and A10 also connect to the
Motherboard. The optional internal automatic
A2
antenna tuner (A14) connects via wires and
plug-in cables to A0. Each signal-processing
module has its own compartment. Figure
A3
5-3 maps the physical locations of these
subassemblies in ORION's chassis.
A4
A0 and A2 share the rear panel space, with
A5
each taking up most of the height and about
half the width of the panel. The rear
connector board (A12) shares the panel half
A6
dominated by the PA. It carries 5 connectors
whose design suits them to mounting on a
A7
board perpendicular to the panel. Together
with 19 connectors on A0, they comprise
A8
almost all of ORION's input/output
connectors for DC, audio, control, and RF.
A9
The MIC, CW, and PH (headphone) jacks
are in front.
A10
Signal Path – Main Receiver
A11
Figure 5-4 diagrams the path a main receiver
A12
RF signal takes from antenna to audio.
A signal from one of ORION's 3 antennas
A13
enters one of the antenna jacks on the rear
panel, where I/O (A0) selects the path to the
A14
RFCNV (A3) via cable 2. Amateur band
Audio
preselection, pre-amplification, and high
dynamic range conversion to the first IF take
place in the RF converter.
From A3, cable 11 brings the IF signal to the
9-MHz IF (A4), where the hardware noise
blanker operates in a wideband environment.
Cables 14A and 14B route the wideband IF
signal through the sweep amplifier (A13) to
A7 for use in ORION's band scope feature.
Four standard and three optional crystal
filters (selected automatically by the BW
control or manually in the menu system)
define the tuned signal bandwidth ahead of
Version 3 – March 2006
56
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